Electronic component supply apparatus and electronic component supply method

ABSTRACT

An electronic component supply apparatus that transports a component supply tape which has accommodation sections and sprocket holes formed at regular intervals and which accommodates an electronic component in each of the accommodation sections, to a component picking-up position and that supplies the electronic component accommodated in the accommodation section to a component mounting apparatus, the electronic component supply apparatus includes a slippage detector that detects slippage occurring in a transport of the component supply tape by a component supply tape transport unit; and a transport correction unit that corrects the transport of the component supply tape by the component supply tape transport unit based on the slippage detected by the slippage detector.

CROSS-REFERENCES TO RELATED APPLICATION(S)

This application is based on and claims priority from Japanese Patent Application No. 2015-001165 filed on Jan. 6, 2015 and Japanese Patent Application No. 2015-001999 filed on Jan. 8, 2015, the entire contents of which are incorporated herein by reference.

BACKGROUND 1. Field of the Invention

One or more embodiments of the present invention relate to an electronic component supply apparatus that transports a component supply tape having an accommodation section in which an electronic component is accommodated and that supplies the electronic component to a component mounting apparatus, and an electronic component supply method.

2. Description of Related Art

As an electronic component supply apparatus of a component mounting apparatus that mounts an electronic component on a substrate, a tape feeder that supplies electronic components in a mode of a component supply tape having a pocket-like accommodation section, in which the electronic component is accommodated, is widely used. The component supply tape is set to a state of being wound and accommodated on a reel and having a predetermined length, and a mounting head of the component mounting apparatus picks up the electronic component from the component supply tape transported to a component picking-up position by the tape feeder. Then, when the component supply tape accommodated on one reel is completely unwound, reel replacement is performed, in which a new reel is set and the next component supply tape is additionally supplied.

As a reel replacement method, a so-called autoloading method in which it is possible to additionally insert a subsequent following component supply tape (following tape) when components are depleted in the preceding component supply tape (preceding tape) is known (see Patent Document 1, for instance). In this method, in addition to a tape feeding mechanism which feeds the component supply tape by pitch along the transport path to the component picking-up position, an inserted-tape feeding unit that feeds a newly inserted following tape to the tape feeding mechanism is separately provided, a sprocket hole on the leading portion of the inserted subsequent tape engages with a sprocket of the preceding-tape feeding mechanism, and thereby, the subsequent tape is fed to the component picking-up position.

Patent Document 1 is JP-A-2014-11291.

SUMMARY

However, the above-described related art has difficulties as follows. That is, in the related art, since the subsequent tape is pushed only to move from the upstream side along the transport path by a tape inserting unit and is not held at an exact position, a stable position or posture of the component supply tape in a thickness direction thereof is not necessarily secured. Hence, in some cases, so-called “slippage” occurs, which means that smooth engagement is not performed between a sprocket hole on the leading portion of the subsequent tape and a feeding pin of a sprocket of a tape drive mechanism, and disengagement slippage occurs between the feeding pin and the component supply tape.

When such “slippage” occurs, a tape feeding amount which has to be achieved through the normal tape feeding by the tape feeding mechanism is not equal to a tape feeding amount achieved by actual feeding drive through engagement of the feeding pin with the sprocket hole. As a result, in a state in which the subsequent tape is fed to the component picking-up position, it is not possible to accurately position the subsequent tape with respect to a suction nozzle of the mounting head and it is not possible to accurately perform a so-called heading-of-component operation in which the leading component of the subsequent tape, which should be a component picking-up target, is positioned exactly at the component picking-up position. In such the related art, a so-called automatic loading method in which it is possible to additionally insert the subsequent component supply tape when the components are depleted in the preceding component supply tape, has a problem in that it is difficult to position the subsequent component supply tape exactly at the component picking-up position.

One or more embodiments of the present invention aim to provide an electronic component supply apparatus in which it is possible to position a subsequent component supply tape exactly at a component picking-up position and an electronic component supply method.

According to an aspect of the embodiments, there is provided an electronic component supply apparatus that transports a component supply tape which has a plurality of accommodation sections and sprocket holes formed at regular intervals and which accommodates an electronic component in each of the accommodation sections, to a component picking-up position and that supplies the electronic component accommodated in the accommodation section to a component mounting apparatus, the electronic component supply apparatus including: a main body unit which is provided with a transport path that guides the component supply tape from an insertion port, through which the component supply tape is inserted, to a discharge port, through which the component supply tape is discharged; an inserted tape feeding unit that transports the component supply tape inserted through the insertion port toward the discharge port along the transport path; a component supply tape transport unit that transports the component supply tape transported along the transport path, toward the discharge port, and positions the accommodation section at the component picking-up position on an upstream side from the discharge port; a slippage detector that detects slippage occurring in the transport of the component supply tape by the component supply tape transport unit; and a transport correction unit that corrects the transport of the component supply tape by the component supply tape transport unit based on the slippage detected by the slippage detector.

According to another aspect of the embodiments, there is provided an electronic component supply apparatus that transports a component supply tape which has a plurality of accommodation sections and sprocket holes formed at regular intervals and which accommodates an electronic component in each of the accommodation sections, to a component picking-up position and that supplies the electronic component accommodated in the accommodation section to a component mounting apparatus, the electronic component supply apparatus including: a main body unit which is provided with a transport path that guides the component supply tape from an insertion port, through which the component supply tape is inserted, to a discharge port, through which the component supply tape is discharged; an inserted tape feeding unit that transports the component supply tape inserted through the insertion port toward the discharge port along the transport path; an electronic component detecting unit that detects an electronic component accommodated in the accommodation section of the component supply tape in the transport path; a component supply tape transport unit that transports the component supply tape transported along the transport path, toward the discharge port, and positions the accommodation section at the component picking-up position on an upstream side from the discharge port; a slippage detector that detects slippage occurring in the transport of the component supply tape by the component supply tape transport unit; and a transport correction unit that corrects the transport of the component supply tape by the component supply tape transport unit based on the slippage detected by the slippage detector and transports the electronic component detected by the electronic component detecting unit to a predetermined position.

According to still another aspect of the embodiments, there is provided an electronic component supply method of transporting a component supply tape which has a plurality of accommodation sections and sprocket holes formed at regular intervals and which accommodates an electronic component in each of the accommodation sections, to a component picking-up position, and supplying the electronic component accommodated in the accommodation section to a component mounting apparatus, the electronic component supply method including: transporting the component supply tape having a leading end portion inserted through an insertion port of a transport path toward a discharge port of the transport path by an inserted tape feeding unit; detecting a leading electronic component of the component supply tape in the transporting of the component supply tape; transferring the leading end portion of the component supply tape to a component supply tape transport unit disposed on a discharge port side of the transport path; detecting slippage of the component supply tape in the transferring of the leading end portion; and transporting the leading electronic component to a predetermined position by performing an additional transport operation corresponding to the detected slippage by the component supply tape transport unit.

According to the embodiments, it is possible to position a subsequent component supply tape exactly at a component picking-up position.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an explanatory diagram illustrating a configuration of an electronic component supply apparatus of an embodiment of the present invention.

FIGS. 2A to 2C are explanatory diagrams illustrating configurations of component supply tapes as supply targets of the electronic component supply apparatus of the embodiment of the present invention.

FIGS. 3A and 3B are explanatory diagrams for illustrating a configuration of a sensor unit used in the electronic component supply apparatus of the embodiment of the present invention.

FIGS. 4A and 4B are explanatory diagrams illustrating output waveforms of the sensor unit used in the electronic component supply apparatus of the embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating output forms of a component detecting sensor and a sprocket hole detecting sensor in the sensor unit used in the electronic component supply apparatus of the embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating component presence/absence detection by the sensor unit used in the electronic component supply apparatus of the embodiment of the present invention.

FIG. 7 is a block diagram illustrating a control processing function of the electronic component supply apparatus of the embodiment of the present invention.

FIG. 8 is an explanatory diagram illustrating a tape transport operation in the electronic component supply apparatus of the embodiment of the present invention.

FIG. 9 is an explanatory diagram illustrating the tape transport operation in the electronic component supply apparatus of the embodiment of the present invention.

DETAILED DESCRIPTION

Next, an embodiment of the present invention will be described with reference to the drawings. First, a configuration of a tape feeder 1 as an electronic component supply apparatus will be described with reference to FIG. 1. The tape feeder 1 has functions of transporting a component supply tape 20 (refer to FIGS. 2A to 2C) having accommodation sections in which electronic components are accommodated, to a component picking-up position, and of supplying the electronic components accommodated in the accommodation sections to a component mounting apparatus.

As illustrated in FIG. 1, the tape feeder 1 is configured to include a main body unit 1 a and a mounting section 1 b provided to protrude downward from an undersurface of the main body unit 1 a. In a state in which the undersurface of the main body unit 1 a is mounted along a feeder base of the component mounting apparatus (not illustrated), the tape feeder 1 is fixed to and mounted on the feeder base, and an internal controller 15 for controlling tape feeding in the tape feeder 1 is connected to an apparatus controller (not illustrated) of the component mounting apparatus. An operation/display panel 16 connected to the controller 15 is provided on the top surface of the main body unit 1 a and enables operational input or display required for operation or state display of the tape feeder 1 to be performed.

A transport path 2 that guides the component supply tape 20 inserted into the tape feeder 1 is provided inside the main body unit 1 a. The transport path 2 is provided to communicate between an insertion port 2 a which is opened at an end portion of the tape feeder 1 on an upstream side (left side in FIG. 1) in a tape feeding direction and through which the component supply tape 20 is inserted, and a discharge port 2 b which is opened at an end portion on a downstream side and through which the component supply tape 20 is discharged.

A feeding sprocket 3 is disposed on the upstream side of the transport path 2 in the vicinity of the insertion port 2 a. The feeding sprocket 3 is mounted, through a one-way clutch mechanism, on a drive shaft 4 which is driven by a feeding motor 3M (refer to FIG. 7). A feeding sprocket sensor 3 a is provided at a joining portion between the feeding sprocket 3 and the drive shaft 4 and is configured to include an encoder which detects that the component supply tape 20 inserted through the insertion port 2 a engages with the feeding sprocket 3. The feeding sprocket sensor 3 a detects the engagement of the component supply tape 20 with the feeding sprocket 3 and thereby, the feeding motor 3M starts driving. In this manner, the component supply tape 20 is transported to the downstream side, that is, toward the discharge port 2 b along the transport path 2.

In the tape feeding of the component supply tape 20 by the feeding sprocket 3, the feeding sprocket 3 is joined to the drive shaft 4 through the one-way clutch mechanism. The one-way clutch mechanism allows the drive shaft 4 of the feeding sprocket 3 to only rotate in a direction relative to the tape feeding direction. In this manner, a drive force transmitted from the drive shaft 4 to the feeding sprocket 3 is limited to rotation in the tape feeding direction. In addition, since the feeding sprocket 3 is freely rotatable in the tape feeding direction regardless of the rotation of the drive shaft 4, the component supply tape 20 engaging with the feeding sprocket 3 moves in the tape feeding direction with no impediment. In the configuration described above, the feeding sprocket 3 driven by the feeding motor 3M functions as an inserted tape feeding unit that transports the component supply tape 20 inserted through the insertion port 2 a toward the discharge port 2 b along the transport path 2.

A following-tape detecting sensor 8 and a following-tape stopper 9 are disposed on the downstream side of the transport path 2 from the feeding sprocket 3. In a state in which the tape feeding of a preceding component supply tape 20 (hereinafter, described as a preceding tape 20 (1)) fed as a component picking-up target is continuously performed, the following-tape stopper 9 has a function of causing a leading end portion of a following component supply tape 20 (hereinafter, described as a following tape 20 (2)) additionally inserted through the insertion port 2 a to come into contact with the following-tape stopper 9 and to stop the following tape 20 (2). The following-tape detecting sensor 8 detects that the following tape 20 (2) stopped in contact with the following-tape stopper 9 is present.

An intermediate sensor 10 is disposed on the downstream side on the transport path 2 from the following-tape stopper 9, and a sensor unit 11 is disposed further on the downstream side from the intermediate sensor 10. The intermediate sensor 10 corresponds to a tape detecting sensor and detects shapes regularly formed on the component supply tape 20 of end portions of the component supply tape 20, that is, a terminal end portion of the preceding tape 20 (1) and a leading end portion of the following tape 20 (2), further, an accommodation section 21 a, a sprocket hole 21 b, or the like, substantially at an intermediate position of the transport path 2 and thereby the intermediate sensor 10 detects that the component supply tape 20 is present or has passed through. As the tape detecting sensor, a sensor other than the intermediate sensor 10 may be disposed on the transport path 2 as long as the sensor has a function of detecting the component supply tape 20.

The sensor unit 11 detects the presence or absence of an electronic component P in the accommodation section 21 a (refer to FIGS. 2A and 2B) of the component supply tape 20 having the following configuration. Here, with reference to FIGS. 2A and 2B, the configuration of the component supply tape 20 is described. As illustrated in FIG. 2A and FIG. 2B, the component supply tape 20 has a base paper tape 21 as a main body, in which the accommodation sections 21 a for accommodating the electronic components P and sprocket holes 21 b for tape feeding are formed at regular intervals. Here, two accommodation sections 21 a are formed, for example, in one pitch of the sprocket hole 21 b.

A cover tape 22 and a bottom tape 23 adhere to the top surface and the undersurface of the base tape 21, respectively, within a range in which the accommodation sections 21 a are formed such that the electronic components P accommodated in the accommodation sections 21 a are prevented from dropping out. Before the electronic component P is picked up out of the component supply tape 20, the cover tape 22 is peeled off from the base tape 21. That is, the target component supply tape 20 according to the present embodiment is configured to have a plurality of accommodation sections 21 a in which the electronic components P are accommodated and the sprocket holes 21 b formed at regular intervals and to accommodate the electronic components P in the accommodation sections 21 a and to cover the electronic components P with the cover tape 22.

Both the cover tape 22 and the bottom tape 23 are optically transparent such that light radiating from below the bottom tape 23 is transmissible to the upper side through a space inside the accommodation section 21 a and the cover tape 22. In the tape feeder 1 of the present embodiment, the light radiating from below the bottom tape 23 is received on the upper side of the cover tape 22 such that the presence or absence of the electronic component P in the accommodation section 21 a is detected.

A component supply tape 20A illustrated in FIG. 2C corresponds to an embossed type tape used to supply relatively large-sized electronic components. Embossed sections 21AE, in which each of the accommodation sections 21 a inside which each of the electronic components P can be accommodated, are formed, are provided in a base tape 21A. In the component supply tape 20A, the cover tape 22 also adheres to the top surface thereof within a range in which the accommodation sections 21 a are formed. Both the base tape 21A and the cover tape 22 are optically transparent or an opening is provided in the bottom of the embossed section 21AE such that light radiating from below the base tape 21A is transmittable to the upper side through the space inside the accommodation section 21 a and the cover tape 22.

A transport sprocket mechanism 7 is provided on the downstream side of the sensor unit 11 and is configured to cause a transport motor 7M (refer to FIG. 7) as the same drive source to drive a first sprocket 5 and a second sprocket 6. The component supply tape 20 is inserted through the insertion port 2 a and is fed along the transport path 2 by the feeding sprocket 3 and the leading end portion of the tape reaches the transport sprocket mechanism 7. Then, the component supply tape 20 engages with the first sprocket 5 and the second sprocket 6 to be further fed to the downstream side and is transported to a component picking-up position 14 set on the upstream side from the discharge port 2 b. A cover member 12 covers the upper side of the transport sprocket mechanism 7 and a cover-tape processing unit 13 is disposed on a back surface of the cover member 12.

A peeling claw of the cover-tape processing unit 13 peels off the cover tape 22 or a cutting blade cuts open the cover tape 22, on the upstream side of the component picking-up position 14, from the component supply tape 20 which is fed by the transport sprocket mechanism 7, thereby the electronic component P accommodated in the accommodation section 21 a is exposed. In this manner, it is possible to pick up the electronic component P by a mounting head (not illustrated) provided in the component mounting apparatus, from the accommodation section 21 a fed to the component picking-up position 14. That is, the cover-tape processing unit 13 has functions of peeling off or cutting open the cover tape 22 of the component supply tape 20 which has yet to reach the component picking-up position 14 and of exposing the electronic component P accommodated in the accommodation section 21 a.

In the configuration described above, the transport sprocket mechanism 7 corresponds to a component supply tape transport unit that transports the component supply tape 20 transported along the transport path 2, toward the discharge port 2 b and positions the accommodation section 21 a at the component picking-up position 14 on the upstream side from the discharge port 2 b. Then, the feeding sprocket 3 as the inserted tape feeding unit and the transport sprocket mechanism 7 as the component supply tape transport unit configure a component supply tape transport unit that transports the component supply tape 20 inserted through the insertion port 2 a toward the discharge port 2 b and positions the accommodation section 21 a at the component picking-up position 14 on the upstream side from the discharge port 2 b. The feeding sprocket 3 and the transport sprocket mechanism 7 can perform both continuous transport in which the component supply tape 20 is continuously fed and pitch transport in which the component supply tape 20 is intermittently fed, as necessary.

Next, with reference to FIGS. 3A and 3B, a configuration and a function of the sensor unit 11 will be described. Sections (A) and (B) in FIG. 3A illustrate a side view and a sectional view of the sensor unit 11, respectively, in a tape transport direction (refer to an arrow a). As illustrated in FIG. 3A, the sensor unit 11 is configured to join a light-emitting section 11 b and a sensor section 11 c on the lower section and an upper section of a plate-shaped unit base 11 a, respectively, which is disposed in a vertical orientation. Attachment portions 26 protrude from side surfaces of the unit base 11 a and attachment holes 26 a are provided in the attachment sections 26 such that the sensor unit 11 is fixed to the main body unit 1 a through the attachment sections 26 by inserting fixing bolts (not illustrated) through the attachment holes 26 a and fastening the bolts to the frame section of the main body unit 1 a. In this manner, the sensor unit 11 is fixed to the main body unit 1 a through the attachment sections 26. The component supply tape 20 as a detecting target is fed through between the top surface of the light-emitting section 11 b and the undersurface of the sensor section 11 c.

A light source 25 mounted to be fixed through a light-source mounting section 25 a is disposed on the light-emitting section 11 b, in an orientation in which a light-emitting direction is set toward the upper side. The sensor section 11 c is irradiated with detecting light by turning on the light source 25. In the sensor section 11 c, a component detecting sensor 28 a and a sprocket hole detecting sensor 28 b are disposed corresponding to positions of the accommodation section 21 a and the sprocket hole 21 b on the component supply tape 20 as the detecting target. Further, an aperture section 27 is mounted on the undersurface of the sensor section 11 c and has a second hole 27 a and a first hole 27 b which are provided corresponding to positions of the component detecting sensor 28 a and the sprocket hole detecting sensor 28 b. As described above, since the cover tape 22 and the bottom tape 23 which adhere to the top and underside surfaces of the component supply tape 20 are optically transparent, inspection light radiating upward by turning on the light source 25 is transmitted through the accommodation section 21 a and the sprocket hole 21 b and is emitted to the upper side. Then, the inspection light is focused through the second hole 27 a and the first hole 27 b and is received at the component detecting sensor 28 a and the sprocket hole detecting sensor 28 b.

FIG. 3B illustrates a positional relationship between a position of the component detecting sensor 28 a and the second hole 27 a and a position of the sprocket hole detecting sensor 28 b and the first hole 27 b in the tape feeding direction. That is, the first hole 27 b and the sprocket hole detecting sensor 28 b positioned for detection of the sprocket hole 21 b as the detecting target are disposed toward the upstream side (left side in FIG. 3B) by a predetermined offset dimension D in the tape feeding direction (an arrow b) from the component detecting sensor 28 a and the second hole 27 a positioned for detection of the presence or absence of the electronic component P as the detecting target in the accommodation section 21 a.

Here, with reference to FIGS. 4A and 4B, a description is provided about detection waveforms output by the component detecting sensor 28 a and the sprocket hole detecting sensor 28 b which receive the detection light radiating from the light source 25. FIGS. 4A and 4B illustrate the detection waveforms obtained when the accommodation section 21 a and the sprocket hole 21 b are the detecting targets, respectively. In FIGS. 4A and 4B, arrows depicted to penetrate through the component supply tape 20 represent inspection light which radiates from the light source 25 and transmits through the component supply tape 20.

First, sections (A) and (B) in FIG. 4A represent detection waveforms in a case where the electronic component P is present in the accommodation section 21 a. The section (A) in FIG. 4A represents a detection waveform Wa in a case where there are gaps 21 a 1 and 21 a 2 on both sides of the electronic component P in the accommodation section 21 a and inspection light transmits upward through the gaps 21 a 1 and 21 a 2 and is received by the component detecting sensor 28 a. In this case, whenever the gaps 21 a 1 and 21 a 2 pass below the component detecting sensor 28 a, the inspection light is received by the component detecting sensor 28 a and two peaks Wa1 and Wa2 having sizes in accordance with a degree of the received light are acquired as the detection waveform Wa.

In addition, as illustrated in the section (B) in FIG. 4A, in a case where the electronic component P is positioned on one side in the accommodation section 21 a and a gap 21 a 3 through which the inspection light is transmittable is present only on one side, the inspection light is received by the component detecting sensor 28 a whenever the gap 21 a 3 passes below the component detecting sensor 28 a and a detection waveform Wb formed of one peak having a size in accordance with a degree of the received light is acquired.

As illustrated in a section (C) in FIG. 4A, in a case where no electronic component P is positioned in the accommodation section 21 a, the inspection light that has been transmitted through the entire range of the component detecting sensor 28 a is received by the component detecting sensor 28 a and one detection waveform Wc having a size in accordance with a light-receiving amount is acquired. The detection waveform Wc is characterized by a waveform width and a peak value greater than the detection waveforms Wa and Wb. Therefore, when the detection waveform corresponds to the detection waveforms Wa and Wb, the electronic component P is present in the accommodation section 21 a and the detection waveform corresponds to the detection waveform Wc, the electronic component P is not present in the accommodation section 21 a. Although omitted in the drawings, the detection waveform having almost no peak may be acquired in a case where the electronic component P is present. This case means that the size of the accommodation section 21 a has small margin with respect to the size of the electronic component P and almost no gap through which the inspection light is transmittable is formed.

Further, FIG. 4B illustrates a detection waveform Wd acquired when the sprocket hole 21 b passes the position of the sprocket hole detecting sensor 28 b. In this case, since the light radiated from the light source 25 is received by the component detecting sensor 28 a as the inspection light which has transmitted through the entire range of the sprocket hole 21 b, the detection waveforms Wd having a great waveform width and peak value are acquired at intervals corresponding to a hole pitches of the sprocket holes 21 b and a tape feeding speed. An evaluation parameter (a waveform width, a peak value, an integrated value, or the like) found from the acquired detection waveforms W is compared to a preset threshold value and thereby, it is possible to detect the presence or absence of the electronic component P in the accommodation section 21 a as the detecting target and the passing of the sprocket hole 21 b.

In the configuration described above, the light source 25, the second hole 27 a, and the component detecting sensor 28 a configure an electronic component detecting unit 24 a that detects the electronic component P accommodated in the accommodation section 21 a of the component supply tape 20, on the upstream side on the transport path 2 from the component picking-up position 14. Similarly, the light source 25, the first hole 27 b, and the sprocket hole detecting sensor 28 b configure a sprocket hole detecting unit 24 b that detects the sprocket hole 21 b of the component supply tape 20 on the upstream side on the transport path 2 from the component picking-up position 14. According to the present embodiment, the electronic component detecting unit 24 a and the sprocket hole detecting unit 24 b configure a single sensor unit 11.

Here, both the electronic component detecting unit 24 a and the sprocket hole detecting unit 24 b are configured of an optical sensor that includes the shared light source 25 as the light-emitting section, and the component detecting sensor 28 a and the sprocket hole detecting sensor 28 b as the light receiving section. That is, the sensor unit 11 is configured to have the light source 25 in which an LED is used as a single light source that emits light for detecting the sprocket hole and light for detecting the electronic component and to have the component detecting sensor 28 a as the light receiving section for detecting the electronic component and the sprocket hole detecting sensor 28 b as the light receiving section for detecting the sprocket hole. In this manner, it is possible to realize a compact sensor unit 11 having a simplified configuration, which has both functions of the sprocket hole detection and the electronic component detection.

Further, the optical sensor is configured to use the transmissive sensor; however, a reflective type sensor which receives reflected light of the light radiating from the light emitting section, which is reflected from a detection target, as the inspection light, may be used. Further, as the sensor used as the electronic component detecting unit 24 a, a magnetic detection type sensor that reacts to a metal portion of the electronic component P and outputs a detection signal may be used instead of the optical sensor.

According to the present embodiment, as illustrated in FIG. 3B, the sprocket hole detecting unit 24 b is disposed on the upstream side by the predetermined offset dimension D from the electronic component detecting unit 24 a in the tape feeding direction. The employment of such a configuration makes it possible to first detect the sprocket hole 21 b, normally, of a pair of accommodation section 21 a and the sprocket hole 21 b which are formed to be close to each other. The sprocket hole detection result is used as a reference and thereby, it is possible to reliably identify a detection signal corresponding to the subsequent accommodation section 21 a and it is possible to perform efficient and highly reliable detection of the presence or absence of the electronic component P in the accommodation section 21 a. The sensor unit 11 may be used as the tape detecting sensor that detects the presence or the passing of the component supply tape 20 on the transport path 2.

Next, with reference to FIG. 5, a correlation between the detection signals of the component detecting sensor 28 a and the sprocket hole detecting sensor 28 b in the sensor unit 11 will be described. In FIG. 5, the output signals of the component detecting sensor 28 a and the sprocket hole detecting sensor 28 b are illustrated as waveforms using two of upper and lower graphs, in which the horizontal axis is shared as the time axis. In the lower graph corresponding to the output of the sprocket hole detecting sensor 28 b, the timings H1, H2, and H3 arranged along the horizontal axis which indicates a time series representing timings at which the center of the sprocket hole 21 b passes the sprocket hole detecting sensor 28 b and the detection waveform Wd illustrated in FIG. 4B is acquired at each of the timings.

In the upper graph corresponding to the output of the component detecting sensor 28 a, timings P10, P15, P20, P25, and P30 arranged along the horizontal axis which indicates a time series represent timings at which the center of the accommodation section 21 a passes the component detecting sensor 28 a and the detection waveform illustrated in FIG. 4A appears at each of the timings. As described above, the component detecting sensor 28 a and the sprocket hole detecting sensor 28 b have the positional relationship of being shifted by the predetermined offset dimension D from each other in the tape feeding direction. Hence, the detection waveform Wa of the accommodation section 21 a adjacent to the sprocket hole 21 b appears after a detection delay time T0 (T01 or T02) from the detection waveform Wd of the sprocket hole 21 b.

Here, the sprocket holes 21 b are formed at regular pitches in the component supply tape 20, however, practically, the component supply tape 20 does not always pass the sensor unit 11 in the tape feeder 1 at a regular speed, and variation is generated. In other words, since the component supply tape 20 is fed in a tape feeding method in which the component supply tape 20 is pushed from the upstream side to the downstream side even when the feeding motor 3M is driven at a regular speed, jamming is likely to occur, such as the component supply tape 20 deformed in an undulated manner on the transport path 2 or partially crumpled component supply tape 20.

When such jamming occurs, the component supply tape 20 does not pass the sensor unit 11 at the regular speed. FIG. 5 illustrates an example in which the passing the intermediate sensor 10 is performed at a low speed due to such jamming between the timings H1 and H2 and the passing is performed at a high speed between the timings H2 and H3 because such jamming is removed. In other words, even when the detection timing is determined in advance based on the driving by the feeding motor 3M, practically, the timing at which the accommodation section 21 a passes the sensor unit 11 is highly likely to deviate from the predetermined detection timing such that it is possible that false detection is performed.

Thus, in the present embodiment, the timing at which the sprocket holes 21 b formed in the component supply tape 20 at regular pitches pass the sensor unit 11 is detected, based on the timing, the detection waveform which is acquired when the accommodation section 21 a passes is identified among the detection signals output from the component detecting sensor 28 a, and the presence or absence of the electronic component P is determined based on the identified detection waveform.

According to the present embodiment, the sensor unit 11 described above detects the electronic component P in the accommodation section 21 a, with the component supply tape 20, which has yet to pass the cover-tape processing unit 13 on the transport path 2, as the target. Therefore, posture stability in the accommodation section 21 a is ensured for the electronic component P as the detecting target, due to the cover tape 22 such that it is possible to achieve high reliability of the component detection. Further, a component detecting process is performed on the upstream side of the cover-tape processing unit 13 such that it is possible to perform optical inspection without the influence of dust or the like which is produced when the cover tape 22 is peeled off or cut open.

Next, with reference to FIG. 7, a configuration and a processing function of the internal controller 15 in the tape feeder 1 will be described. The controller 15 is connected to the transport motor 7M that drives the transport sprocket mechanism 7 and to the feeding motor 3M that drives the feeding sprocket 3 and controls the driving of the motors 7M and 3M. In addition, the controller 15 is connected to the component detecting sensor 28 a, the sprocket hole detecting sensor 28 b, the following-tape detecting sensor 8, the intermediate sensor 10, and the feeding sprocket sensor 3 a which configure the sensor unit 11, and receives the detection signals from the sensors. Further, the controller 15 is connected to a state displaying section 16 a and an operation switch group 16 b which are provided on the operation/display panel 16 (refer to FIG. 1) such that the controller 15 controls a display process performed by the state displaying section 16 a, receives an operation signal input through the operation switch group 16 b, and transmits and receives a signal to and from the component mounting apparatus through a communication unit 40 which corresponds to a communication interface.

The processing function of the controller 15 will be described. The controller 15 internally includes a sensing information storage unit 30, a component presence/absence determining unit 31, a component depletion determining unit 32, a following-tape transport processing unit 33, a following-tape transfer processing unit 34, a slippage detection processing unit 35, a heading-of-component processing unit 36, a preceding-tape transport processing unit 37, a preceding-tape discharge processing unit 38, and a component presence/absence information storage unit 39.

The sensing information storage unit 30 stores sensing information detected by the component detecting sensor 28 a, the sprocket hole detecting sensor 28 b, the following-tape detecting sensor 8, the intermediate sensor 10, and the feeding sprocket sensor 3 a. The controller 15 performs control processes of the units based on the sensing information stored in the sensing information storage unit 30.

The component presence/absence determining unit 31 determines the presence or absence of the electronic component P in the accommodation section 21 a based on information from the sprocket hole detecting unit 24 b and information from the electronic component detecting unit 24 a. In other words, the component presence/absence determining unit 31 identifies the information obtained from the electronic component detecting unit 24 a when the accommodation section 21 a passes the electronic component detecting unit 24 a, based on the information from the sprocket hole detecting unit 24 b, and determines the presence or absence of the electronic component P in the accommodation section 21 a which has passed the electronic component detecting unit, based on identified information.

In this manner, the information obtained when the accommodation section 21 a passes the electronic component detecting unit 24 a is identified based on the information from the sprocket hole detecting unit 24 b and thereby, it is possible to perform the component detection with high accuracy without the influence of variation of the passing speed of the component supply tape 20 on the transport path 2. Hence, in the tape feeder 1 according to the present embodiment, the controller 15 controls the component supply tape transport unit (the feeding sprocket 3 and the transport sprocket mechanism 7) described above, based on the determination result of the component presence/absence determining unit 31.

The component depletion determining unit 32 determines component depletion in the preceding tape 20 (1) based on the determination result of the component presence/absence determining unit 31. In other words, when the determination result of the component presence/absence determining unit 31 indicates “absence” in one accommodation section 21 a or “absence” consecutively a plurality of times, depletion of the electronic components P in the preceding tape 20 (1) is determined. Based on the determination of the component depletion, the accommodation section 21 a of the preceding tape 20 (1), in which the final component Pe (refer to FIG. 8) is accommodated, is identified and a preceding-tape discharge instruction or a preceding-tape replacement instruction is output at a timing at which the final component Pe reaches the component picking-up position 14.

The following-tape transport processing unit 33 performs a process of causing the feeding sprocket 3 which corresponds to the inserted tape feeding unit to transport the following tape 20 (2) inserted through the insertion port 2 a. In other words, the following-tape transport processing unit 33 performs the process in which the leading end portion 20 s of the following tape 20 (2) is fed to the following-tape stopper 9 which means a standby position, the following tape 20 (2) is temporarily stopped, and the following tape 20 (2) is transported to a delivery position to the first sprocket 5 of the transport sprocket mechanism 7 after the preceding tape 20 (1) is discharged.

The following-tape transfer processing unit 34 performs a process of delivering the leading end portion 20 s of the following tape 20 (2) transported through the process of the following-tape transport processing unit 33 after the depleted preceding tape 20 (1) is discharged by the transport sprocket mechanism 7. In other words, the following-tape transfer processing unit 34 corresponding to a subsequent-tape delivery unit that causes the feeding sprocket 3 to transport the following tape 20 (2) which is the subsequent component supply tape 20 on the transport path 2 and that delivers a leading end portion 20 s of the following tape 20 (2) to the transport sprocket mechanism 7, after the transport sprocket mechanism 7 transports the depleted preceding tape 20 (1).

The slippage detection processing unit 35 performs a process of detecting “slippage” occurring when the transport sprocket mechanism 7 transports the following tape 20 (2). In other words, the slippage detection processing unit 35 detects “slippage” which means tape feeding slippage occurring when the following tape 20 (2) which is fed by pitch by the feeding sprocket 3 is delivered to the transport sprocket mechanism 7. In other words, the slippage detection processing unit 35 corresponds to a slippage detector that detects slippage occurring when the transport sprocket mechanism 7 which corresponds to the component supply tape transport unit transports the component supply tape 20 (following tape 20 (2)).

Here, “slippage” means abnormal tape feeding due to the rotation of the first sprocket 5 in a state in which feeding claws do not normally engage with the sprocket holes 21 b in a tape feeding method in which the first sprocket 5 is caused to rotate in a state in which the feeding claws of the first sprocket 5 engage with the sprocket holes 21 b formed in the base tape 21 at regular pitches. “Slippage” causes a difference to be generated between a tape feeding amount on data, obtained through a rotation amount of the first sprocket 5 and a tape feeding amount by which the following tape 20 (2) is actually transported. As a result, when the following tape 20 (2) is fed to the component picking-up position 14 and the leading component Ps is positioned at the component picking-up position 14, a tape feeding error occurs by the amount of “slippage”.

According to the present embodiment, the heading-of-component processing unit 36 to be described below corrects such a tape feeding error. In other words, the heading-of-component processing unit 36 corrects the transport of the following tape 20 (2) by the transport sprocket mechanism 7 based on the slippage detected by the slippage detection processing unit 35 and thereby, a heading-of-component process of positioning the leading component Ps in the following tape 20 (2) at the component picking-up position 14 is performed.

Therefore, the heading-of-component processing unit 36 corrects the transport of the component supply tape 20 (following tape 20 (2)) by the transport sprocket mechanism 7 which corresponds to the component supply tape transport unit, based on the slippage detected by the slippage detection processing unit 35 which corresponds to the slippage detector, and corresponds to the transport correction unit that transports the electronic component P detected by the electronic component detecting unit 24 a to a predetermined position.

The slippage detector will be described. The slippage detector includes a tape detector having a function of detecting an actual feeding amount of the component supply tape 20. The feeding amount (K1) of the component supply tape 20 by the transport sprocket mechanism 7 is compared to the actual feeding amount (K2) of the component supply tape 20, which has been detected by the tape detector, such that slippage is quantitatively detected.

As an example of the tape detector, a configuration may be used, in which shapes regularly formed in the component supply tape 20, for example, the accommodation sections 21 a or the sprocket holes 21 b, are detected by the detection function of the intermediate sensor 10, the sensor unit 11, or the like. According to the configuration, it is possible to perform slippage detection using features of the shape or configuration of the component supply tape 20 and it is advantageous that no additional devising are required. Specific examples of the configuration include an example in which the sprocket hole detecting unit 24 b provided in the sensor unit 11 is used. In the specific example, the sprocket hole 21 b is optically detected by the sprocket hole detecting unit 24 b. Pitch feeding times (K1) of the transport sprocket mechanism 7 is compared to the number (K2) of the sprocket holes 21 b detected by the sprocket hole detecting unit 24 b, by a processing function of the slippage detection processing unit 35 such that slippage is detected.

In the slippage detection process, counting of pitch transport times K1 and the number K2 of the sprocket holes is performed until feeding times of the feeding motor 3M reaches predetermined times (feeding times until the leading end portion 20 s of the following tape 20 (2) reaches a predetermined position, that is, feeding times for reliably resolving slippage) and a calculation of the slippage times Ks=(K1−K2) is performed. In the heading-of-component process by the heading-of-component processing unit 36, in which the leading component Ps is positioned at the component picking-up position 14, the correction of the pitch feeding times is performed based on the slippage detection result described above. Here, the following two cases exist depending on whether or not the leading component Ps is detected before the slippage detecting process.

First, in a case (case 1) where the leading component Ps is detected before the slippage detecting process is completed, pitch feeding times Kn required for the heading-of-component is calculated after the slippage detecting process and pitch feeding is performed by the pitch feeding times Kn. The pitch feeding times Kn is obtained as follows. Here, the necessary pitch feeding times (feeding amount) until the leading component Ps which is positioned of the sensor unit 11 is transported to the component picking-up position 14 is Ka and pitch feeding times until the slippage detecting process is completed after the leading component Ps is detected by the sensor unit 11 is Kb. In this case, the pitch feeding times Kn required for the heading-of-component is obtained using a calculating equation, Kn=Ka−Kb+Ks.

Meanwhile, in a case (case 2) where the leading component Ps is detected after the slippage detecting process, the pin of the first sprocket 5 normally engages with the sprocket hole 21 b of the following tape 20 (2) such that there is no need to consider slippage. Therefore, the pitch feeding times Kn required for the heading of component after the detection of the leading component Ps satisfies Kn=Ka.

The preceding-tape transport processing unit 37 performs a process of transporting the electronic components P accommodated in the accommodation section 21 a to the component picking-up position 14, in order, by transporting the preceding tape 20 (1) by pitch, based on the instruction from the component mounting apparatus. The preceding-tape discharge processing unit 38 performs a process of discharging an empty tape part of the preceding tape 20 (1) through the discharge port 2 b after the final component Pe of the preceding tape 20 (1) reaches the component picking-up position 14. In other words, the preceding-tape discharge processing unit 38 which corresponds to a tape discharge processing unit drives the transport sprocket mechanism 7 until feeding amounts of the component supply tape 20 by the transport sprocket mechanism 7 are accumulated to become a predetermined feeding amount after the passing of the terminal end portion 20 e of the component supply tape 20 is detected by the tape detecting sensor such as the intermediate sensor 10 on the transport path 2.

The component presence/absence information storage unit 39 stores the presence or absence of a component in the accommodation sections 21 a of the component supply tape 20, which is detected by the component presence/absence determining unit 31, that is, the accommodation sections 21 a present between the sensor unit 11 and the component picking-up position 14, for each accommodation section 21 a. In the preceding-tape transport process by the preceding-tape transport processing unit 37, how many pitch feeding times the preceding tape 20 (1) is fed is controlled based on the component presence/absence information for each accommodation section 21 a, which is stored in the component presence/absence information storage unit 39.

In the configuration described above, the electronic component detecting unit 24 a provided in the sensor unit 11, that is, the electronic component detecting unit 24 a that detects the electronic component P accommodated in the accommodation section 21 a of the component supply tape 20 on the transport path 2, is not an essential element in a view point of an object of the heading of component by positioning the accommodation section 21 a, in which the leading component Ps is accommodated, to the component picking-up position 14.

In other words, when the number of empty accommodation sections in a leading end part of the component supply tape 20 is strictly inspected such that, it is ensured that N accommodation sections 21 a from the leading end portion 20 s are always empty, the position of the leading component Ps is uniquely identified in the leading end part of the component supply tape 20. Therefore, when information of the position of the leading component Ps and information of the position of the component picking-up position 14 on the transport path 2 are given in advance, it is possible to perform the heading of the leading component Ps without identifying an actual leading component Ps. In this configuration, the heading-of-component processing unit 36 functions as the transport correction unit that corrects the transporting of the component supply tape 20 by the transport sprocket mechanism 7 based on the slippage detected by the slippage detector described above, with the information of the position described above as a prerequisite.

Next, a component presence/absence determining process will be described with reference to FIG. 6. The component presence/absence determination is performed using a process function of the component presence/absence determining unit 31 (refer to FIG. 7) which is included in the controller 15. The component presence/absence determining unit 31 identifies a range of the detection waveform corresponding to the accommodation section 21 a of the output information on the component detecting sensor 28 a which is stored in the sensing information storage unit 30. Specifically, the timings H1 and H2 are detected using the output of the sprocket hole detecting sensor 28 b and timings T1 and T2 obtained by a delay of standard delay time DT from the timings H1 and H2 are determined. According to the present example, since the accommodation sections 21 a are provided at a pitch which is half the pitch of the sprocket hole 21 b, the component presence/absence determining unit 31 equally divides a zone between the timings T1 to T2 (first cycle) into two zones of a first zone A1 and a second zone A2 with a time reference. The first zone A1 and the second zone A2 correspond to the accommodation sections 21 a, one to one, and contain a continuous detection waveform (hereinafter, referred to as a continuous waveform) obtained between time points of immediately before the accommodation sections 21 a corresponding to the zones A1 and A2 pass the component detecting sensor 28 a and immediately after the passing.

Next, the component presence/absence determining unit 31 evaluates the output of the component detecting sensor 28 a in the respective first zone A1 and the second zone A2 and the presence or absence of a component in the accommodation section 21 a which has passed the component detecting sensor 28 a is determined by determining whether the output corresponds to the detection waveform Wc. The determination is performed in a method in which an evaluation parameter such as a mean value, an integrated value, or the like, of the detection waveform, is compared to a preset threshold value based on a component presence/absence pattern illustrated in FIG. 4A, or the like. In this manner, the component presence/absence determining unit 31 identifies output information (detection waveform) obtained from the component detecting sensor 28 a, based on the information from the sprocket hole detecting sensor 28 b, when the accommodation section 21 a passes the component detecting sensor 28 a and the presence or absence of the electronic component in the passing accommodation section, based on the identified output information.

The component presence/absence determining unit 31 also executes the same process in a cycle from a second cycle S2 when the component presence/absence determining process is ended in a first cycle S1. The standard delay time DT used when the timings T1 and T2 are determined in the component presence/absence determining process is used to adjust the timings T1 and T2 such that the timings T1 and T2 are not overlapped in the continuous waveform and the standard delay time DT does not have to be necessarily used. For example, in a case where the offset dimension D is set such that the component detecting sensor 28 a does not detect the accommodation section 21 a but detects a portion of the component supply tape 20 when the sprocket hole detecting sensor 28 b detects the passing of the sprocket hole, the component presence/absence determining process may be performed with the timings H1 and H2 as the timings T1 and T2 without any delay.

Next, with reference to FIG. 8 and FIG. 9, the tape feeding operation of the component supply tape 20 in the tape feeder 1 will be described. Here, an electronic component supply method in which the component supply tape 20 illustrated in FIGS. 2A and 2B is inserted through the insertion port 2 a of the transport path 2 and transported to the component picking-up position 14 along the transport path 2 and the electronic component P accommodated in the accommodation section 21 a is supplied to the component mounting apparatus is illustrated and a processing method of the component supply tape 20 in the tape feeder 1 is illustrated.

(1) to (5) in FIG. 8 and (1) to (4) in FIG. 9 schematically illustrate a simplified series of tape feeding operations of the preceding tape 20 (1) and the following tape 20 (2) which is additionally refilled to be subsequent to the preceding tape 20 (1) in the same tape feeder 1. The preceding tape 20 (1) and the following tape 20 (2) are discharged from the discharge port 2 b passing, from the upstream side, the feeding sprocket 3, the following-tape stopper 9 and the following-tape detecting sensor 8, the intermediate sensor 10, the sensor unit 11, the first sprocket 5, and the component picking-up position 14, in this order. In such tape feeding, arrows by solid lines indicate a continuous feeding transport operation in which the tape feeding of the component supply tape 20 is continuously performed and arrows by dotted lines indicate a pitch feeding transport operation in which the tape feeding of the component supply tape 20 is intermittently performed.

(1) in FIG. 8 illustrates a state in which an operator inserts the following tape 20 (2) through the insertion port 2 a based on a component refilling instruction in a state in which the component supply is continued by the pitch feeding (an arrow c) of the preceding tape 20 (1) in the tape feeder 1. Here, the leading end portion 20 s of the following tape 20 (2) is inserted to the downstream side passing the feeding sprocket 3. In this manner, the feeding sprocket 3 rotates, the driving of the feeding motor 3M is started by detecting of the rotation by the feeding sprocket sensor 3 a, and the transport of the following tape 20 (2) is performed.

As illustrated in (2) in FIG. 8, the leading end portion 20 s of the following tape 20 (2) reaches the following-tape stopper 9 and the following-tape detecting sensor 8 detects the following tape 20 (2) and thereby, the driving of the feeding motor 3M is stopped and the following tape 20 (2) is stopped. Then, the following tape 20 (2) waits at the position when the terminal end portion 20 e of the preceding tape 20 (1) which is repetitively fed by pitch (an arrow d) passes the intermediate sensor 10. The operation illustrated in (1) and (2) in FIG. 8 described above corresponds to a following-tape preparing step in which the subsequently refilled following tape 20 (2) is prepared in a pitch feeding process of the preceding tape 20 (1).

The following-tape preparing step is executed by controlling the respective units by the following-tape transport processing unit 33 (refer to FIG. 7). In other words, after the intermediate sensor 10 which is the tape detecting sensor detects the passing of the terminal end portion 20 e of the preceding component supply tape 20 (preceding tape 20 (1)), the following-tape transport processing unit 33 functions as a subsequent-tape transport unit that causes the feeding sprocket 3 to transport the following tape 20 (2) which is the subsequent component supply tape 20 to a position which is detected by the intermediate sensor 10, on the transport path 2.

Then, as illustrated in (3) and (4) in FIG. 8, the preceding tape 20 (1) is further fed (arrows e and f) by pitch. In other words, the transport motor 7M feeds the preceding tape 20 (1) by pitch and transports the electronic components P accommodated in the accommodation sections 21 a to the component picking-up position 14 in order, based on the instruction from the component mounting apparatus. After the intermediate sensor 10 as the tape detecting sensor detects the passing of the terminal end portion 20 e of the preceding tape 20 (1), as illustrated in (4) in FIG. 8, the feeding sprocket 3 which corresponds to the inserted tape feeding unit continuously feeds and transports (an arrow g) to a position at which the intermediate sensor 10 can detect the subsequent tape 20 (2) on the transport path 2. When the intermediate sensor 10 detects the following tape 20 (2), the feeding motor 3M is stopped and the following tape 20 (2) waits at the position.

In the pitch feeding of the preceding tape 20 (1) illustrated in (2) and (3) in FIG. 8, the component presence/absence determining unit 31 performs the presence or absence determination of the electronic component P in the accommodation section 21 a passing the sensor unit 11, using the output from the sensor unit 11. The component presence/absence determination result is stored as the component presence/absence information in association with the respective accommodation sections 21 a in the component presence/absence information storage unit 39. The component depletion determination, the heading-of-component process, and the tape discharge process to be described below are executed based on the component presence/absence information stored in the component presence/absence information storage unit 39.

In a case where the component presence/absence determining unit 31 determines “absence” with respect to one accommodation section 21 a, or “absence” consecutively, the controller 15 determines that the final component Pe is accommodated in the accommodation section 21 a which is determined as “presence” at the last time and calculates the pitch feeding times (final component pitch feeding times) which are needed until the final component Pe reaches the component picking-up position 14. Hence, when the tape feeding of the preceding tape 20 (1) is performed, subtraction of the final component pitch feeding times is performed whenever the pitch feeding is performed.

(4) in FIG. 8 illustrates a state in which the final component pitch feeding times becomes zero and the final component Pe reaches the component picking-up position 14 in the tape feeding of the preceding tape 20 (1). In this state, the controller 15 notifies the component mounting apparatus of an indication thereof. The component mounting apparatus that receives the notification outputs the preceding-tape discharge instruction or the preceding-tape replacement instruction to the tape feeder 1 after the mounting head picks up the final component Pe at the component picking-up position 14.

The operation illustrated in (3) and (4) in FIG. 8 corresponds to a preceding-tape pitch feeding step in which the preceding tape 20 (1) is fed by pitch, the sensor unit 11 performs the component presence/absence detection, and the pitch feeding is repetitively executed until the final component Pe reaches the component picking-up position 14. Then, the preceding-tape pitch feeding step is executed by controlling the respective units by the preceding-tape transport processing unit 37 (refer to FIG. 7) of the controller 15.

In other words, when the determination result of the component presence/absence determining unit 31 is “absence” or “absence” a plurality of consecutive times, the controller 15 determines that the electronic components P are depleted in the preceding tape 20 (1) and notifies the component mounting apparatus of the indication thereof. After the final component Pe is picked up at the component picking-up position 14, the controller 15 causes the transport sprocket mechanism 7 which corresponds to the component supply tape transport unit to transport the depleted preceding tape 20 (1) to the discharge port 2 b.

In addition, when the determination result of the component presence/absence determining unit 31 is first “presence” after the leading end portion 20 s of the following tape 20 (2) passes the electronic component detecting unit 24 a, the controller 15 determines that the leading component Ps which is the leading electronic component P of the following tape 20 (2) is detected and causes the transport sprocket mechanism 7 which corresponds to the component supply tape transport unit to transport the following tape 20 (2) such that the leading component Ps is positioned at the component picking-up position 14.

When the preceding-tape discharge instruction or the preceding-tape replacement instruction is output, the preceding-tape discharge processing unit 38 controls the respective units and thereby a preceding-tape discharge process to be described below is executed such that the depleted preceding tape 20 (1) is discharged after the final component Pe is picked up. Here, in a stage in which the final component Pe reaches the component picking-up position 14, there are two cases depending on whether or not the intermediate sensor 10 disposed on the transport path 2 already detects the passing of the terminal end portion 20 e of the preceding tape 20 (1).

First, in the case (case 1) where the passing of the terminal end portion 20 e is already detected, a tape feeding amount (driving time of the transport motor 7M, an encoder pulse amount, pitch feeding times, or the like) required for the preceding tape 20 (1) to be transported from the intermediate sensor 10 to the discharge port 2 b is already found out. Thus, the preceding-tape discharge processing unit 38 calculates a remaining tape feeding amount required for the preceding tape 20 (1) to be discharged using the timing at which the preceding tape 20 (1) passes the intermediate sensor 10 and the tape feeding amount required for the final component Pe to reach the component picking-up position 14 from the timing, and the preceding-tape discharge processing unit 38 drives the transport motor 7M by the tape feeding amount. In this manner, after the final component Pe is picked up, the depleted preceding tape 20 (1) is discharged (an arrow h) from the discharge port 2 b through the continuous feeding transport.

Meanwhile, in a stage in which the final component Pe reaches the component picking-up position 14 and in the case (case 2) in which the passing of the terminal end portion 20 e has yet to be detected, the transport motor 7M is driven as is and the discharge of the preceding tape 20 (1) is started. In the process of the tape feeding operation for the discharge, when the intermediate sensor 10 detects the passing of the terminal end portion 20 e, the transport motor 7M is driven by an amount required for the tape feeding of the preceding tape 20 (1) from the position of the intermediate sensor 10 to the discharge port 2 b. In this manner, after the final component Pe is picked up, the depleted preceding tape 20 (1) is discharged from the discharge port 2 b through the continuous feeding transport.

After the final component Pe (last component) is picked up at the component picking-up position 14 after the component depletion determining unit 32 determines depletion, the preceding-tape discharge processing unit 38 functions as a tape discharge processing unit that transports the depleted preceding tape 20 (1) in the component supply tape transport unit to the discharge port 2 b through the continuous feeding transport.

In addition, when the terminal end portion 20 e of the preceding tape 20 (1) passes the intermediate sensor 10, the feeding motor 3M is driven and the transport of the following tape 20 (2) is started. As illustrated in (4) in FIG. 8, when the intermediate sensor 10 detects the leading end portion 20 s of the following tape 20 (2), the feeding motor 3M is stopped and the following tape 20 (2) waits at the position. Next, as illustrated in (5) in FIG. 8 and (1) in FIG. 9, the terminal end portion 20 e of the preceding tape 20 (1) passes the sensor unit 11, the feeding motor 3M is driven and the transport (an arrow i) of the following tape 20 (2) is started through the continuous feeding. When the sensor unit 11 detects the leading end portion 20 s of the following tape 20 (2), the feeding motor 3M is stopped. At this timing, the detection of the leading component Ps passing the sensor unit 11 is started.

When the discharge (an arrow j) of the preceding tape 20 (1) is completed in (1) in FIG. 9, the following tape 20 (2) is transported (an arrow k) through the continuous feeding and a following-tape transfer process of causing the following tape 20 (2) to engage with the first sprocket 5 of the transport sprocket mechanism 7 and of transferring the following tape 20 (2) is started. First, the feeding motor 3M is driven and the following tape 20 (2) is transported (an arrow 1) through the continuous feeding until the leading end portion 20 s approaches the vicinity of the first sprocket 5 as illustrated in (2) in FIG. 9.

Next, when the leading end portion 20 s approaches the vicinity of the first sprocket 5, the tape feeding operation of the feeding motor 3M is changed to the pitch feeding (an arrow m) and the tape feeding operation of the transport motor 7M that drives the first sprocket 5 is also changed to the pitch feeding as illustrated in (3) in FIG. 9. At that time, both counting of pitch transport times K1 of the transport motor 7M and counting of the number K2 of the sprocket holes 21 b which have passed the sprocket hole detecting sensor 28 b are started. The pitch transport of the feeding motor 3M is stopped at a timing at which it is considered that the leading end portion 20 s of the following tape 20 (2) passes the first sprocket 5 and then, only the transport motor 7M is driven and performs the tape transport (an arrow n) through the pitch feeding of the following tape 20 (2).

The leading end portion 20 s of the following tape 20 (2) passes the component picking-up position 14, the leading component Ps reaches the component picking-up position 14 as illustrated in (4) in FIG. 9 and thereby, the heading of component of the following tape 20 (2) is completed. Then, the leading component Ps is picked up by the mounting head of the component mounting apparatus and then, the picking-up of the component from the following tape 20 (2) as a target is started.

In other words, in the electronic component supply method described above, the component supply tape 20 having the leading end portion 20 s inserted through the insertion port 2 a on the transport path 2 is transported toward the discharge port 2 b on the transport path 2 by the feeding sprocket 3 which is the inserted tape feeding unit ((1) in FIG. 8 to (2) in FIG. 9)) (inserted tape transporting step). In the inserted tape transporting step, the leading component Ps (leading electronic component) of the component supply tape 20 is detected ((1) in FIG. 9) (leading component detecting step).

Next, the leading end portion 20 s of the component supply tape 20 is transferred to the transport sprocket mechanism 7 which is the component supply tape transport unit disposed on the discharge port 2 b side on the transport path 2 ((3) in FIG. 9) (transferring step) and the slippage of the component supply tape 20 is detected in the transferring step (slippage detecting step). A transport operation by the transport sprocket mechanism 7 is performed in the margin by an amount of slippage detected in the slippage detecting step and thereby, the leading component Ps is transported to the component picking-up position 14 which is the predetermined position ((4) in FIG. 9) (heading of component step).

In the slippage detecting step described above, the feeding amount (K1) of the transport sprocket mechanism 7 is compared to the actual feeding amount (K2) of the component supply tape 20 such that slippage is detected. Specifically, the pitch feeding times (K1) of the transport sprocket mechanism 7 are compared to the number (K2) of the sprocket holes detected by the sprocket hole detecting unit 24 b of the sensor unit 11 which corresponds to the sprocket hole detector such that slippage is detected.

As described above, in the tape feeder 1 and the component supply method by the tape feeder 1 according to the present embodiment, when the component supply tape 20 is transported to the component picking-up position 14 and the electronic component P accommodated in the accommodation section 21 a is supplied to the component mounting apparatus, the component supply tape 20 transported along the transport path 2 is transported toward the discharge port 2 b and slippage, which occurs in the transport of the component supply tape 20 by the transport sprocket mechanism 7 that positions the accommodation section 21 a at the component picking-up position 14 on the upstream side from the discharge port 2 b, is detected by the slippage detector such that the transport of the component supply tape 20 by the transport sprocket mechanism 7 is corrected based on detected slippage.

In this manner, the tape feeding error due to slippage occurring when the following tape 20 (2) which is the subsequent component supply tape 20 is transferred to the transport sprocket mechanism 7 is corrected such that it is possible to position the subsequent component supply tape 20 exactly at the component picking-up position 14.

An electronic component supply apparatus and an electronic component supply method of the embodiments is effective in that it is possible to position the subsequent component supply tape exactly at the component picking-up position and is applicable in a component mounting field in which an electronic component is mounted on a substrate. 

What is claimed is:
 1. An electronic component supply apparatus comprising: a main body unit which is provided with a transport path that guides a component supply tape which has a plurality of accommodation sections and sprocket holes formed at regular intervals and which accommodates an electronic component in each of the accommodation sections, from an insertion port, through which the component supply tape is inserted, to a discharge port, through which the component supply tape is discharged; an inserted tape feeding unit that transports the component supply tape inserted through the insertion port toward the discharge port along the transport path; a component supply tape transport unit that transports the component supply tape transported along the transport path, toward the discharge port, and positions the accommodation section at a component picking-up position at which the electronic component is picked up on an upstream side from the discharge port; a slippage detector that detects slippage occurring when transferring a leading end portion of the component supply tape to the component supply tape transport unit; a transport correction unit that corrects the transport of the component supply tape by the component supply tape transport unit based on the slippage detected by the slippage detector to position a leading electronic component accommodated in the component supply tape at the component picking-up position; and a sensor unit that detects the leading electronic component, wherein the slippage detector includes a tape detector that is a sprocket hole detector that optically detects at least one of the sprocket holes in the component supply tape, and wherein the slippage detector compares pitch feeding times of the component supply tape transport unit to the number of the sprocket holes detected by the sprocket hole detector to detect slippage.
 2. The electronic component supply apparatus according to claim 1, wherein the tape detector detects an actual feeding amount of the component supply tape, and compares a feeding amount of the component supply tape transport unit to the actual feeding amount of the component supply tape to detect the slippage.
 3. The electronic component supply apparatus according to claim 2, wherein the tape detector detects shapes regularly formed on the component supply tape.
 4. An electronic component supply method of transporting a component supply tape which has a plurality of accommodation sections and sprocket holes formed at regular intervals and which accommodates an electronic component in each of the accommodation sections, to a component picking-up position, and supplying the electronic component accommodated in the accommodation section to a component mounting apparatus, the electronic component supply method comprising: transporting the component supply tape having a leading end portion inserted through an insertion port of a transport path toward a discharge port of the transport path by an inserted tape feeding unit; detecting a leading electronic component of the component supply tape in the transporting of the component supply tape; transferring the leading end portion of the component supply tape to a component supply tape transport unit disposed on a discharge port side of the transport path; detecting slippage of the component supply tape in the transferring of the leading end portion; and transporting the leading electronic component to a predetermined position by performing an additional transport operation corresponding to the detected slippage by the component supply tape transport unit, wherein, in the slippage detecting, at least one of the sprocket holes in the component supply tape is optically detected, and pitch feeding times of the component supply tape transport unit is compared to the number of the sprocket holes detected by the sprocket hole detector to detect the slippage.
 5. The electronic component supply method according to claim 4, wherein, in the slippage detecting, a feeding amount of the component supply tape transport unit is compared to an actual feeding amount of the component supply tape to detect the slippage. 